Filaments Motion in a Slit-Type Interlacer: Role of Supplied Air Pressure

In order to make clear the mechanism of interlacing process in a slit-type interlacer, the effects of supplied air pressure on filaments motion were studied using a high-speed video camera and particle image velocimetry (PIV). Results obtained are as follows: (1) The cycle time, tangling state time and opening state time were clarified by measuring 20 cycles of interlacing process independently of supplied air pressures. (2) The mean number of tangles and the calculated number of tangles were almost the same at supplied air pressures of 0.2 MPa and 0.3 MPa. Meanwhile, the calculated number of tangles was higher than the mean number of tangles at supplied air pressures of 0.1 MPa, 0.4 MPa and 0.5 MPa. (3) The summed deviation coefficient was effective to extract a characteristic cycle in the interlacing process. (4) The supplied air pressure of 0.3 MPa was the optimum condition to generate tangling parts when the interlacer and the sample yarn were used in this study. In this case, the average distance of filaments was over 0.4 mm and the opening state time was over 0.70 ms. In case that the supplied air pressure is less than 0.3 MPa, the average distance of filaments was under 0.4 mm and the opening state time became longer.